At a glance
3rd And Harrison is a 240,700-square-foot office building at 450 3RD AVE W in Seattle, Washington, built in 2016. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 30.3 kBtu/ft² and 32 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 30.3 kBtu/ft² |
| Source EUI | 84.8 kBtu/ft² |
| GHG emissions | 32 tCO₂e |
| GHG intensity | 0.2 kgCO₂e/ft² |
| Electricity | 1,634,087 kWh |
| Gross floor area | 240,700 sq ft |
| Source record | seattle:50237:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 30.3 kBtu/ft² | 32 tCO₂e | |
| 2024 | — | 28.1 kBtu/ft² | 30 tCO₂e | |
| 2023 | 88 | -1 | 33.6 kBtu/ft² | 36 tCO₂e |
| 2022 | 89 | -6 | 33.0 kBtu/ft² | 35 tCO₂e |
| 2021 | 95 | +4 | 30.3 kBtu/ft² | 32 tCO₂e |
| 2020 | 91 | +2 | 36.9 kBtu/ft² | 39 tCO₂e |
| 2019 | 89 | +1 | 48.1 kBtu/ft² | 51 tCO₂e |
| 2018 | 88 | -7 | 47.5 kBtu/ft² | 51 tCO₂e |
| 2017 | 95 | 47.4 kBtu/ft² | 54 tCO₂e |
Compliance context
Seattle Energy Benchmarking Ordinance (SMC 22.920)
Seattle's Building Emissions Performance Standard (adopted 2023) applies to buildings over 20,000 sq ft: benchmarking verification is due 2027–2030 and initial emissions targets 2031–2035, reaching net zero by 2041–2050, with fines for non-compliance.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 450 3RD AVE W
- City
- Seattle
- State
- Washington
- ZIP
- 98119
- Coordinates
- 47.62267, -122.36040
Within ~1 km
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- 3131 Elliott Bldgscore 77
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See also: most efficient in Seattle · biggest emitters
How does 3rd And Harrison compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. Its site EUI of 30.3 kBtu/ft² is about 32% below the average of 44.8 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 0.2 kgCO₂e/ft² is about 74% below the group average of 0.7 kgCO₂e/ft².
At 240,700 sq ft, it is about 23% above the average floor area of 196,452 sq ft for those buildings. It was built in 2016, 51 years later than the group's average year built (1965). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has 3rd And Harrison's energy performance changed over time?
BuildingCensus holds 9 Seattle disclosures for 3rd And Harrison, covering report years 2017–2025. Its ENERGY STAR score went from 95 in 2017 to 88 in 2023 (-7 points); its best year on file was 2017, at 95. Site EUI moved from 47.4 kBtu/ft² (2017) to 30.3 kBtu/ft² (2025), a 36% decrease. Reported emissions went from 54 tCO₂e to 32 tCO₂e over the same span (down 40%).
What does a site EUI of 30.3 kBtu/ft² mean?
Site energy-use intensity (EUI) is the energy a building uses on site in a year divided by its floor area, in thousand Btu per square foot — lower is more efficient. 3rd And Harrison's 30.3 kBtu/ft² across 240,700 sq ft works out to about 7.3 billion Btu (2,137 MWh-equivalent) in 2025. Its source EUI of 84.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,634,087 kWh of electricity for the year.
Which law requires 3rd And Harrison to report its energy use?
3rd And Harrison reports under the Seattle Energy Benchmarking Ordinance (SMC 22.920), the legal basis of Seattle's Building Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2025 disclosure (source record seattle:50237:2025). Seattle's Building Emissions Performance Standard (adopted 2023) applies to buildings over 20,000 sq ft: benchmarking verification is due 2027–2030 and initial emissions targets 2031–2035, reaching net zero by 2041–2050, with fines for non-compliance.
More office buildings in Seattle
- 1000 Dexter Phase Ii· 240,454 sq ft · score 86 (A)
- 6100 Building· 238,148 sq ft · score 94 (A)
- Fourth & Battery Building· 234,000 sq ft · score 83 (B)
- 1015 2nd Avenue Bldg· 232,045 sq ft · EUI 22.6 kBtu/ft²
- 202 Westlake· 231,510 sq ft · score 85 (A)
- 1100 Dexter· 228,460 sq ft · score 88 (A)
- Office buildings in Seattle· 497 benchmarked
- All Seattle benchmarked buildings· Seattle Energy Benchmarking Ordinance (SMC 22.920)
- Most efficient large buildings in Seattle
- Least efficient large buildings in Seattle
- Biggest emitters in Seattle
Frequently asked questions
What is 3rd And Harrison's energy grade?
3rd And Harrison did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 30.3 kBtu/ft².
How much energy does 3rd And Harrison use?
Its 2025 site energy-use intensity was 30.3 kBtu/ft² (84.8 kBtu/ft² source) across 240,700 sq ft, including 1,634,087 kWh of electricity.
What are 3rd And Harrison's carbon emissions?
3rd And Harrison reported 32 tCO₂e of greenhouse-gas emissions (0.2 kgCO₂e/ft²) for 2025.
Where is 3rd And Harrison?
3rd And Harrison is at 450 3RD AVE W, in Seattle, Washington 98119. Its coordinates are 47.62267, -122.36040 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is 3rd And Harrison and when was it built?
3rd And Harrison has 240,700 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2016 as its year built. It is classed as office.
Is 3rd And Harrison covered by the Seattle Energy Benchmarking Ordinance (SMC 22.920)?
Yes — it appears in the 2025 Building Energy Benchmarking disclosure, which lists the buildings reporting under the Seattle Energy Benchmarking Ordinance (SMC 22.920).
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About this data
Source: Building Energy Benchmarking (Seattle Energy Benchmarking Ordinance (SMC 22.920)), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “3rd And Harrison, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/3rd-and-harrison-b903a693 (data as of October 2, 2026).